Cite

Music/Sonata, violin, piano (1927)

MLA

Koch, Frederick R. (Frederick Robinson). Music/Sonata, violin, piano (1927). Box 332, folder 1886. 1927 May. https://collections.library.yale.edu/catalog/9998462.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 332, folder 1886"])(1927 May)[Music/Sonata, violin, piano (1927)]. https://collections.library.yale.edu/catalog/9998462.